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nonoae m I v "V A. L. ALLEN &G-. W. HARRIS. I fAii'ffiaratuS" for obtaining. Heat from Gas. No.23 l6,86 9. I Patented Jan. 25,1881.

. N- PEIERS. PHOTD-UTHOGRAPMERLWASHINGTON D O UNITED STATES PATENT OFFICE.

AUGUSTUS L. ALLEN AND GEORGE W. HARRIS, OF POUGHKEEPSIE, ASSIGN- ORS OF ONE-THIRD TO HORATIO P. ALLEN, OF NEW YORK, N. Y.

APPARATUS FOR OBTAINING HEAT FROM GAS.

SPECIFICATION-forming part of Letters Patent No. 236,869, dated January 25, 1881.

Application filed October 29, 1880. (No model.)

To all whom it may concern:

Be it known that we, AUGUSTUS L. ALLEN and GEORGE W. HARRIS, of Poughkeepsie, in the county of Dutchess and State of New York, have invented certain new and useful Improvements in the Form and Construction of Heaters, Furnaces, and Apparatus for Obtaining Heat by the Combustion of Illuminating or N oil-Illuminating Gas; and we do hereby declare that the following is a full, clear, and correct description thereof, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is. an elevation, partly in section, of devices embodying our invention. Fig. 2

is a front elevation. Fig. 3 is a horizontal section, showing the bottom plate and relative position of the hoods. Fig. 4: is a detached view of the bottom plate and burner. Fig. 5 is an enlarged view of the burner, showing tit e means employed for regulating the supply 0 air.

Like letters refer to like parts wherever they occur. 7

Our invention relates to the construction of heaters or furnaces for obtaining heat from gas; and hasfor its object to obtain such a combination and arrangement of a circulation coil or coils,a gas-burner or gas-burners for 0 heating the same, and a series of hoods for confining the heated air and products and causing the same to impinge upon the coils as will insure the most effective application of the heat, and also to effect such a circulation of the hot 3 5 air and products of combustion as will thoroughly utilize the heat from the escaping hot air.

To this end it consists, mainly, in the combination, in a gas heater or furnace, of a spiral 4.0 circulating-coil, tapering or having the form of a frustum of a cone, with a burner arranged below the same, and of substantially the diameter of the lower coil, and two or more inclosin g-hoods, the inner having a contracted opening above, so as to retard the passage of the heated air, &c., and the next of the series or outer hood opewbeloW, whereby the products of combustion and heated air are caused, first, to impinge on the spiral coil, and, secondly,

a series of return-flues are obtained, whereby the waste heat is utilized.

It consists, also, in details of construction and specific combinations, hereinafter more specifically set forth.

Provided the relation of the coil, burner, 5 and hood to each other be preserved, as herein specified, the combination may be duplicated or multiplied by the use of a series of coils and hoods concentrically arranged when larger furnaces or heaters or greater heating capacity is desired.

We will now proceed to describe our inven tion, so that others skilled in the art to which it appertains may apply the same.

In the drawings, L L indicate the outer case, which may be of any suitable form or size, and is provided with an opening, L, in the bottom-plate, which should correspond in form, 850., to the shape of the burner and coil employed. From the edge of the opening L depends a flange or collar, K, for the protection of the burner.

B indicates the burner, which generally corresponds in form to the opening L of the baseplate and the form of the coil. In the present instance it is circular, as shown in Fig. 5, and is provided with a sliding collar, 0, which controls a series of perforations, P, which, accordingly as they are opened or closed, regulate the amount of air admitted for admixture with So the gas to insure perfect combustion. This burner B is arranged within the flange or collar K and below the opening L in the bottom plate.

Within the case L and directly over the burner B is a spiral coil, A, for the circulation of fluids, said coil having an induction-pipe, G, at its lower end, and an eduction-pipe, H,

above, the coils of the pipe gradually decreasin g from below up, so as to give the form of a pyramid or frustum of a cone. The lowest coil is preferably of the same size as the burner, and the tubing employed may be of any suitable size, preferably from three-quarters (5}) of an inch to one and one-quarter (1%) inch in 5 diameter. The induction-pipe G and eduction-pipe H may be connected with any suitable radiator, reservoir, 01'' boiler.

2 5 invention.

Inclosing the coil A is a cone-shaped shell or hood, G, which conforms to the outline of the coil, so as to deflect the hot air and cause it to impinge on the coil. This shell or hood 0 rests upon the base-plate of case L, and is open above to allow the escape of the hot air and products of combustion; but the opening is somewhat smaller than the top ring of the coil, so as to throttle them in their passage.

Surrounding the inner hood, 0, is an outer hood, D, closed above but open below, of hell form, and which is of such diameter as to form an annular descending flue around theinner shell, through which the heated air and products of combustion pass and escape into the outer shell, L, passing thence around an oven, E, arranged over the hood I), and thence to the outlet F.

M indicates a small door or slide with mica center, placed in the shell of the heater for use in lighting and observing the burning of the gas.

The following duplication of parts may be made without departing from the spirit of our One or more spiral coils may be placed inside of spiral coil A, the coils being arranged concentrically, and each coil provided with its own burner, corresponding in diameter with the base-ring of said coil, and also with a hood corresponding to hood 0. \Vhen such a modification is employed the several coils may be connected, but are preferably each provided with its own eduction and induction pipes, and connected to separate radiators or boilers.

In practical working one or more spiral coils, with one or more burners, 850., may be used, and one or more radiating coils connected with said spiral coils.

The whole being filled with water, which will be regulated by an expansive column attached to the highest radiator, upon lighting the gas-burner the spiral coil becomes heated,

which causes the water to circulate from the bottom to the top of the spiral coil, thence to the radiator, and, after imparting its heat, to return to the bottom of the spiral coil, to be again heated in like manner; or the spiral coil may be connected with a boiler, and hot water he carried by circulating-pipes to the difl'erent parts of a house or premises for various purposes. The inner cone or hood will cause the heated air to impinge on the spiral coil, and the surplus heat will pass out at the top and down between the hoods, thence into the outer shell and around the oven to the escape-pipe.

Having thus described our invention, what we claim, and desire to secure by Letters Patent, is-

1. In a gas heater or furnace, the combination of an outer shell or case, a close-coiled tapering circulating-coil, a cone-shaped inner shell or hood having a contracted opening above to retard the escape of the heated air, 850., and an outer hood, closed above, and arranged to form, with the inner shell or hood, a descending flue, substantially as and for the purpose specified.

2. The combination, in a gas heater or furnace, of an outer shell or case having an opening in the base-plate, a gas-burner arranged therein, a circulating-coil arranged within the shell or case and over the burner, and provided with an induction and eduction pipe, an inner shell or hood inclosing the circulatingcoil, an outer hood inclosing the inner shell, and forming therewith a descending flue, and an oven arranged in the case and over the outer hood, substantially as and for the purpose specified.

AUGUSTUS L. ALLEN. GEO. W. HARRIS. \Vitnesses:

THOS. S. IIALLIWELL, GEORGE W. HALLIWELL. 

